package filter;

import pojo.User;
import util.Constants;

import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class SysFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        User user = (User)((HttpServletRequest) req).getSession().getAttribute(Constants.USER_SESSION);
        if(user == null) {
            response.sendRedirect(((HttpServletRequest) req).getContextPath() + "/error.jsp");
        } else {
            chain.doFilter(req, resp);
        }
    }

    @Override
    public void destroy() {

    }
}
